THE SIZE-VIRIAL RADIUS RELATION OF GALAXIES
نویسندگان
چکیده
منابع مشابه
Measuring the Virial Masses of Disk Galaxies
I present detailed models for the formation of disk galaxies, and investigate which observables are best suited as virial mass estimators. Contrary to naive expectations, the luminosities and circular velocities of disk galaxies are extremely poor indicators of total virial mass. Instead, I show that the product of disk scale length and rotation velocity squared yields a much more robust estima...
متن کاملThe relation between the virial theorem and the fundamental plane of elliptical galaxies
The analysis of the properties of a sample of elliptical galaxies for which the kinetic energy of both random and rotational motions are consistently defined, shows that more than half of the so-called ‘tilt’ of the fundamental plane of elliptical galaxies is accounted for by the non-homology in the dynamical structure of the systems. We find that the kinetic energy of random motions is proport...
متن کاملThe Universal Rotation Curve of Spiral Galaxies. Ii the Dark Matter Distribution out to the Virial Radius
In the current ΛCDM cosmological scenario, N -body simulations provide us with a Universal mass profile, and consequently a Universal equilibrium circular velocity of the virialized objects, as galaxies. In this paper we obtain, by combining kinematical data of their inner regions with global observational properties, the Universal Rotation Curve (URC) of disk galaxies and the corresponding mas...
متن کاملThe Size-star Formation Relation of Massive Galaxies
We study the relation between size and star formation activity in a complete sample of 225 massive (M∗ > 5 · 10 M⊙) galaxies at 1.5 < z < 2.5, selected from the FIREWORKS UV-IR catalog of the CDFS. Based on stellar population synthesis model fits to the observed restframe UV-NIR SEDs, and independent MIPS 24μm observations, 65% of galaxies are actively forming stars, while 35% are quiescent. Us...
متن کاملThe luminosity - size relation of galaxies to z = 1 ?
We use the Hubble Ultra Deep Field (UDF) to study the galaxy luminosity-size (M-R e) distribution. With a careful analysis of selection effects due to both detection completeness and measurement reliability we identify bias-free regions in the M-R e plane for a series of volume-limited samples. We also investigate the colour-log(n) distribution of these galaxies and further subdivide our data b...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2013
ISSN: 2041-8205,2041-8213
DOI: 10.1088/2041-8205/764/2/l31